Tough is the word and perfection by design Don't need a watertight membrane in these boots, because they are built extremely well and NO water gets in! Easy on and off. I walk any distance, hiking, etcetc., I change shoes. I want the protection the boots offer and not many if any equal these, imo. I treat them with Mink products by Kiwi and Water Pruf by Kiwi, but not much needed. Randy,"Polarbear"